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Les ondes mecaniques progressives periodiques

.

I
(

:

1
:
.
.

*

,
f

,

.

.

1

(... A3, A

2, A1)

.

,T =

f
.

,

.

*

GBF

.

M
2

... , 3.d1 , 2.d
1

d1

:

*

.

,

2
.

.

T

*

.

(

)

*

.

T

(

)

:

*

= V .T
V =
:

, (

)

T

3
.

.

,

:

*

.

:

*

( Hz )
20
25
30
35
( cm )
1
0.9
0.8
0.7
20
22.5
24
24.5
V ( m/s ) *
2
10-

,

:

*

.

:

*

.

,

.

I
( I

:

*

.

.T = 2. :
y (t)
S
= A.Cos (.t + )

S

:

2
.

.
=
:

T
. y (t)
M
= y (t
S
- ) :

M

.

:
*

:

3.7 cm 1s
;
0.9 = 0.25 s
;
0.75 T = 0.2 s

2.
1
=
=
s
T
y (t)
S
= 20 1
. 0 2
- Cos (10. .t + )
:

= +
ou
= - :
Cos ( ) = 0
y (0)
S
= 0
t = 0

2
2 3.
= -
=
:

(
)

2
2
-

2
3.
y (t) = 20 1
. 0
Cos (10. .t +
)
( m )
S
:

2

:

.

( K N ) SM = K . +
:

*

2
.

( K N ) SM = K . :

*

.

I
( II
:

*

,

.

.

(
)

:

.

,

:

a

.

.( a )

En difference de phase

Le stroboscope

Onde sonore

Frequence

Periodicite
Vibrations

Temporelle / Spatiale

Source

longueur d'onde

Milieu de propagation

Milieu dispersif
periode

Sinusoidale

Pulsation

Diffraction

Synchrones

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